1 #ifndef __ARCH_I386_PERCPU__
2 #define __ARCH_I386_PERCPU__
7 * PER_CPU finds an address of a per-cpu variable.
11 * reg - 32bit register
13 * The resulting address is stored in the "reg" argument.
16 * PER_CPU(cpu_gdt_descr, %ebx)
19 #define PER_CPU(var, reg) \
20 movl %fs:per_cpu__##this_cpu_off, reg; \
21 lea per_cpu__##var(reg), reg
22 #define PER_CPU_VAR(var) %fs:per_cpu__##var
24 #define PER_CPU(var, reg) \
25 movl $per_cpu__##var, reg
26 #define PER_CPU_VAR(var) per_cpu__##var
29 #else /* ...!ASSEMBLY */
32 * PER_CPU finds an address of a per-cpu variable.
36 * cpu - 32bit register containing the current CPU number
38 * The resulting address is stored in the "cpu" argument.
41 * PER_CPU(cpu_gdt_descr, %ebx)
45 /* This is used for other cpus to find our section. */
46 extern unsigned long __per_cpu_offset
[];
48 #define per_cpu_offset(x) (__per_cpu_offset[x])
50 /* Separate out the type, so (int[3], foo) works. */
51 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
52 #define DEFINE_PER_CPU(type, name) \
53 __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
55 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
56 __attribute__((__section__(".data.percpu.shared_aligned"))) \
57 __typeof__(type) per_cpu__##name \
58 ____cacheline_aligned_in_smp
60 /* We can use this directly for local CPU (faster). */
61 DECLARE_PER_CPU(unsigned long, this_cpu_off
);
63 /* var is in discarded region: offset to particular copy we want */
64 #define per_cpu(var, cpu) (*({ \
65 extern int simple_indentifier_##var(void); \
66 RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
68 #define __raw_get_cpu_var(var) (*({ \
69 extern int simple_indentifier_##var(void); \
70 RELOC_HIDE(&per_cpu__##var, x86_read_percpu(this_cpu_off)); \
73 #define __get_cpu_var(var) __raw_get_cpu_var(var)
75 /* A macro to avoid #include hell... */
76 #define percpu_modcopy(pcpudst, src, size) \
79 for_each_possible_cpu(__i) \
80 memcpy((pcpudst)+__per_cpu_offset[__i], \
84 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
85 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
87 /* fs segment starts at (positive) offset == __per_cpu_offset[cpu] */
88 #define __percpu_seg "%%fs:"
90 #include <asm-generic/percpu.h>
91 #define __percpu_seg ""
94 /* For arch-specific code, we can use direct single-insn ops (they
95 * don't give an lvalue though). */
96 extern void __bad_percpu_size(void);
98 #define percpu_to_op(op,var,val) \
100 typedef typeof(var) T__; \
101 if (0) { T__ tmp__; tmp__ = (val); } \
102 switch (sizeof(var)) { \
104 asm(op "b %1,"__percpu_seg"%0" \
109 asm(op "w %1,"__percpu_seg"%0" \
114 asm(op "l %1,"__percpu_seg"%0" \
118 default: __bad_percpu_size(); \
122 #define percpu_from_op(op,var) \
125 switch (sizeof(var)) { \
127 asm(op "b "__percpu_seg"%1,%0" \
132 asm(op "w "__percpu_seg"%1,%0" \
137 asm(op "l "__percpu_seg"%1,%0" \
141 default: __bad_percpu_size(); \
145 #define x86_read_percpu(var) percpu_from_op("mov", per_cpu__##var)
146 #define x86_write_percpu(var,val) percpu_to_op("mov", per_cpu__##var, val)
147 #define x86_add_percpu(var,val) percpu_to_op("add", per_cpu__##var, val)
148 #define x86_sub_percpu(var,val) percpu_to_op("sub", per_cpu__##var, val)
149 #define x86_or_percpu(var,val) percpu_to_op("or", per_cpu__##var, val)
150 #endif /* !__ASSEMBLY__ */
152 #endif /* __ARCH_I386_PERCPU__ */
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